"Arthur is the projectile spam character of Marvel vs. Capcom 3. He has some great ranged attacks, and each has different properties. It's important to note that he has no dash and a slow jump, so you want to keep people away with Arthur. If they get up close, you have some options, as well as a versatile Level 3 hyper combo (For the Princess), but you should keep to the projectiles.

"You should get comfortable using his Golden Armor hyper combo, which powers him up, including his projectiles. It does have a timer, which will eventually reduce you to your boxers, but you can put the armor back on by doing the same hyper again. But you have to be willing to take that risk. The boost to the projectiles makes it worth it."